The car was pelted with stones by the followers who also threw a coconut on it which resulted in the front wind-shield getting damaged as Krishnaiah was proceeding to file his nomination papers, they said.
"Neither Krishnaiah nor any one else was injured in the incident. We have registered a case in connection with the incident and further probe is on," Deputy Commissioner of Police (L B Nagar Zone), P Viswa Prasad told PTI, adding that they have identified the attackers.
"The protesters were dispersed. Krishnaiah subsequently filed his nomination papers," the DCP said.
In another incident, Jai Samaikyandhra Party candidate for Khammam Lok Sabha seat, Nagarjuna Rao was allegedly attacked by TRS activists after the former reportedly instigated them with his remarks in Madhira town of Khammam while enroute to filing his nomination papers, another police official said.
Meanwhile, the TDP office in Nalgonda town was ransacked by supporters of aggrieved aspirants of the party reportedly resenting over BJP-TDP seat sharing agreement.